CVE-2026-64089: Software Security Vulnerability Vulnerability

CRITICAL
Advisory Identifier: GHSA-7jfx-377j-9v79
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CVSS 9.8
Published
Advisory Summary

CVE-2026-64089 is a CRITICAL (CVSS 9.8) security vulnerability vulnerability (General Security Weakness) affecting Software libraries in the Maven ecosystem. Remediation is available in the latest vendor maintenance releases.

CVE-2026-64089 at a Glance

CVE Identifier CVE-2026-64089
GHSA Identifier GHSA-7jfx-377j-9v79
Severity CRITICAL
CVSS v3.1 Base Score 9.8
CWE Classification General Security Weakness
Affected Product Software
Package Ecosystem Maven
Published Date
Last Updated

Security Impact

CVSS: 9.8

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H).

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required None (PR:N)
User Interaction None (UI:N)
Scope Unchanged (S:U)
Confidentiality High (C:H)
Integrity High (I:H)
Availability High (A:H)

How to Fix CVE-2026-64089

To remediate this vulnerability, upgrade all affected Software dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

mvn dependency:tree

How to Check if You Are Affected

To determine whether your Java application is affected by CVE-2026-64089, inspect your build dependencies using the Maven Dependency Plugin:

mvn dependency:tree

Analyze the terminal output to locate any version of Software in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than the patched release), your application is affected.

Note: The mvn dependency:tree command inspects the resolved dependency graph declared in your project's POM files; it does not perform automated security scanning or inspect runtime dynamic classpaths. Always verify runtime container classpaths and shaded JARs.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under General Security Weakness. In Software, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

In the Linux kernel, the following vulnerability has been resolved: batman-adv: tt: fix negative last_changeset_len batadv_piv_tt::last_changeset_len len was declared as s16, but the field is never intended to hold a negative value. When a value greater than 32767 is assigned, it wraps to a negative signed integer. In batadv_send_my_tt_response(), last_changeset_len is temporarily widened to s32. The incorrectly negative s16 value propagates into the s32, causing batadv_tt_prepare_tvlv_local_data() to allocate a full sized buffer but populates only a small portion of it with the collected changeset. All remaining bits are kept uninitialized. Using an u16 avoids this type confusion and ensures that no (negative) sign extension is performed in batadv_send_my_tt_response().

References

NVD — CVE-2026-64089 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-64089
git.kernel.org/stable/c/179eb62506... WEB
https://git.kernel.org/stable/c/179eb62506a02d00370bd6478898cb632e10986c
git.kernel.org/stable/c/22d59c72f4... WEB
https://git.kernel.org/stable/c/22d59c72f4a47ffec121d0610f70d0d70c3c11c8
git.kernel.org/stable/c/55dc41fe88... WEB
https://git.kernel.org/stable/c/55dc41fe8821e9a849e147255ad572bc933a9d15
git.kernel.org/stable/c/6314089acf... WEB
https://git.kernel.org/stable/c/6314089acf0ddf64376fdc0b1420695504c73f52
git.kernel.org/stable/c/c424e8519a... WEB
https://git.kernel.org/stable/c/c424e8519ac78eac5d9f4eecf06208a0d619ec14
git.kernel.org/stable/c/d29abf70c6... WEB
https://git.kernel.org/stable/c/d29abf70c665730e249d2ec8e1402095ae26bcee
git.kernel.org/stable/c/eb235472b5... WEB
https://git.kernel.org/stable/c/eb235472b52ef36981c5aad330485eaf2382c53b
git.kernel.org/stable/c/fc92cdfcb2... WEB
https://git.kernel.org/stable/c/fc92cdfcb295cefa4344d71a527d61b638b7bfc4

Frequently Asked Questions

What is CVE-2026-64089?
CVE-2026-64089 is a security vulnerability in Software classified as a security vulnerability vulnerability under General Security Weakness.
Which Software versions are affected?
Affected versions include releases prior to current release patches.
What version fixes CVE-2026-64089?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
What is the CVSS score of CVE-2026-64089?
CVE-2026-64089 has a CVSS v3.1 base score of 9.8 (CRITICAL) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
What CWE is associated with CVE-2026-64089?
CVE-2026-64089 is classified under General Security Weakness.
How can I check Maven dependencies for CVE-2026-64089?
Run the dependency tree command: 'mvn dependency:tree'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
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  "id" : "GHSA-7jfx-377j-9v79",
  "modified" : "2026-07-20T15:31:59Z",
  "published" : "2026-07-19T18:31:51Z",
  "aliases" : [ "CVE-2026-64089" ],
  "details" : "In the Linux kernel, the following vulnerability has been resolved:\n\nbatman-adv: tt: fix negative last_changeset_len\n\nbatadv_piv_tt::last_changeset_len len was declared as s16, but the field is\nnever intended to hold a negative value. When a value greater than 32767 is\nassigned, it wraps to a negative signed integer.\n\nIn batadv_send_my_tt_response(), last_changeset_len is temporarily widened\nto s32. The incorrectly negative s16 value propagates into the s32, causing\nbatadv_tt_prepare_tvlv_local_data() to allocate a full sized buffer but\npopulates only a small portion of it with the collected changeset. All\nremaining bits are kept uninitialized.\n\nUsing an u16 avoids this type confusion and ensures that no (negative) sign\nextension is performed in batadv_send_my_tt_response().",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
  } ],
  "affected" : [ ],
  "references" : [ {
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    "url" : "https://git.kernel.org/stable/c/179eb62506a02d00370bd6478898cb632e10986c"
  }, {
    "type" : "WEB",
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  "database_specific" : {
    "cwe_ids" : [ ],
    "severity" : "CRITICAL",
    "github_reviewed" : false,
    "github_reviewed_at" : null,
    "nvd_published_at" : "2026-07-19T16:17:49Z"
  }
}